TY  - GEN
AU  - Parkinson,Howard E.
ED  - United States.
TI  - Mine pager to  public telephone interconnect system
T2  - Report of investigations
PY  - 1974///]
CY  - [Washington]
PB  - U.S. Dept. of the Interior, Bureau of Mines
KW  - Telephone in mining
KW  - Mine communications systems
ER  -